TEZ-2578. Update docs for 0.5.4 release
TEZ-2578. Update docs for 0.5.4 release

guiling/tez,sidseth/tez,ueshin/apache-tez,dongjiaqiang/tez,ChetnaChaudhari/tez,bernhardschaefer/tez,apache/tez,Parth-Brahmbhatt/tez,navis/tez,jth/tez,guiling/tez,dongjiaqiang/tez,ChetnaChaudhari/tez,ChetnaChaudhari/tez,guiling/tez,sidseth/tez,sidseth/tez,ChetnaChaudhari/tez,apache/tez,navis/tez,sidseth/tez,jth/tez,guiling/tez,bernhardschaefer/tez,Parth-Brahmbhatt/tez,bernhardschaefer/tez,Parth-Brahmbhatt/tez,apache/tez,dongjiaqiang/tez,ueshin/apache-tez,jth/tez,Parth-Brahmbhatt/tez,sidseth/tez,dongjiaqiang/tez,ueshin/apache-tez,jth/tez,bernhardschaefer/tez,navis/tez,apache/tez,jth/tez,dongjiaqiang/tez,ChetnaChaudhari/tez,ueshin/apache-tez,Parth-Brahmbhatt/tez,guiling/tez,navis/tez,apache/tez,bernhardschaefer/tez,navis/tez,ueshin/apache-tez